The F-400N Series Variable Area Flowmeters have been very popular flowmeters
for a long time. These variable area flowmeters feature superior styling,
quality materials and a variety of options. F-400N Series variable area
flowmeters are machined of the highest quality acrylic which is polished to a
crystal clear finish. Additional variable area flowmeter design features
include: Corrosion and wear resistant internal parts, sturdy well built
adapters and Viton o-ring seals. Permanent scales are screen printed onto
the variable area flowmeter body, directly in front of the float for easy
reading.

Other variable area flowmeter series, configurations and flow ranges are
available. To select a variable area flowmeter other than what we list
here we need the desired mounting configuration, liquid being measured, and
measurement range in GPM, LPM or SCFM.

Variable Area Flowmeters are tested and calibrated for water or air only.
Although variable area flowmeters may be suitable for other chemicals, it is
the responsibility of the user to determine the suitability of the variable
area flowmeter in their application.

Variable Area Flowmeter Installation Instructions

The variable area flowmeter must be installed in an exact vertical plane to
ensure accuracy.

Use Teflon® tape (or similar) on all pipe threads. Acrylic and other
exotic plastics cannot tolerate PVC Glue and/or pipe dope. Even fumes can
cause crazing. If you are installing your variable area flowmeter to a
glued pipe installation, install the variable area flowmeter after all glued
fittings are dried and lines are purged of all fumes. Never hold the
variable area flowmeter with pliers or like tools. DO NOT OVER-TIGHTEN!

Wall, floor and ceiling mounts must be carefully aligned and sturdy.
Wall, floor and ceiling supports are recommended as needed. This is to
maintain pipe alignment and to prevent vibration.

Valves - Avoid a system that will impose a sudden burst of flow to the variable
area flowmeter. Such a burst will cause the float to impact the float
stop with destructive force which may damage the variable are flowmeter.
Solenoid valves or other quick opening valves cannot be used unless variable
area meter is protected against sudden bursts of flow. (If necessary a
surge chamber should be installed. This will also be useful in high
pressure start-up situations.) The variable area flowmeter is not
warranted against this type of damage.

Maximum working pressure not to exceed recommended psi at fluid temperature
(see Variable Area Flowmeter Manual for more information).